Set of control knobs



FIG. 1 is a front perspective view of a set of control knobs in which environment comprising a treadmill is disclaimed;

FIG. 2 is a back perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left-side view thereof;

FIG. 6 is a right-side view thereof;

FIG. 7 is a top view thereof;

FIG. 8 is a bottom view thereof;

FIG. 9 is an enlarged front perspective view of one of the control knobs with the disclaimed environment removed for clarity of disclosure. The claimed design includes the mirror image of the control knob depicted that is not shown;

FIG. 10 is an enlarged back perspective view thereof;

FIG. 11 is an enlarged top view thereof;

FIG. 12 is an enlarged bottom view thereof;

FIG. 13 is an enlarged left-side view thereof. The expanded right-side view is identical to the expanded left-side view; and,

FIG. 14 is an enlarged front view thereof.

The broken lines depict portions of the treadmill or portions thereof and/or environment of the treadmill or portions thereof which form no part of the claimed design. 

CLAIM The ornamental design for a set of control knobs, as shown and described. 